sgi-xp: setup the activate GRU message queue

5b8669df · Dean Nelson <[email protected]> · 2008-07-29 22:34:18 -07:00

Setup the activate GRU message queue that is used for partition activation
and channel connection on UV systems.

Signed-off-by: Dean Nelson <[email protected]>
Cc: Jack Steiner <[email protected]>
Cc: "Luck, Tony" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Commit: 5b8669dfd110a62a74eea525a009342f73987ea0
Parents: 83469b55

Changes

8 files changed · +1328 −390

File	Status	Add	Del	Content
drivers/misc/sgi-xp/xp.h	modified	+2	−1	View file
drivers/misc/sgi-xp/xp_uv.c	modified	+10	−0	View file
drivers/misc/sgi-xp/xpc.h	modified	+128	−30	View file
drivers/misc/sgi-xp/xpc_channel.c	modified	+15	−7	View file
drivers/misc/sgi-xp/xpc_main.c	modified	+246	−83	View file
drivers/misc/sgi-xp/xpc_partition.c	modified	+22	−6	View file
drivers/misc/sgi-xp/xpc_sn2.c	modified	+154	−233	View file
drivers/misc/sgi-xp/xpc_uv.c	modified	+751	−30	View file

Only the first 600 diff lines are shown. Download the complete patch.

drivers/misc/sgi-xp/xp.h

View file

diff --git a/drivers/misc/sgi-xp/xp.h b/drivers/misc/sgi-xp/xp.h
index 45d0a08..9ac5758 100644
--- a/drivers/misc/sgi-xp/xp.h
+++ b/drivers/misc/sgi-xp/xp.h
@@ -208,8 +208,9 @@ enum xp_retval {
 	xpNeedMoreInfo,		/* 57: more info is needed by SAL */
 
 	xpGruCopyError,		/* 58: gru_copy_gru() returned error */
+	xpGruSendMqError,	/* 59: gru send message queue related error */
 
-	xpUnknownReason		/* 59: unknown reason - must be last in enum */
+	xpUnknownReason		/* 60: unknown reason - must be last in enum */
 };
 
 /*

drivers/misc/sgi-xp/xp_uv.c

View file

diff --git a/drivers/misc/sgi-xp/xp_uv.c b/drivers/misc/sgi-xp/xp_uv.c
index 44f2c2b..d9f7ce2 100644
--- a/drivers/misc/sgi-xp/xp_uv.c
+++ b/drivers/misc/sgi-xp/xp_uv.c
@@ -42,15 +42,25 @@ xp_remote_memcpy_uv(unsigned long dst_gpa, const unsigned long src_gpa,
 	return xpGruCopyError;
 }
 
+static int
+xp_cpu_to_nasid_uv(int cpuid)
+{
+	/* ??? Is this same as sn2 nasid in mach/part bitmaps set up by SAL? */
+	return UV_PNODE_TO_NASID(uv_cpu_to_pnode(cpuid));
+}
+
 enum xp_retval
 xp_init_uv(void)
 {
 	BUG_ON(!is_uv());
 
 	xp_max_npartitions = XP_MAX_NPARTITIONS_UV;
+	xp_partition_id = 0;	/* !!! not correct value */
+	xp_region_size = 0;	/* !!! not correct value */
 
 	xp_pa = xp_pa_uv;
 	xp_remote_memcpy = xp_remote_memcpy_uv;
+	xp_cpu_to_nasid = xp_cpu_to_nasid_uv;
 
 	return xpSuccess;
 }

drivers/misc/sgi-xp/xpc.h

View file

diff --git a/drivers/misc/sgi-xp/xpc.h b/drivers/misc/sgi-xp/xpc.h
index 1e48f77..4c26181 100644
--- a/drivers/misc/sgi-xp/xpc.h
+++ b/drivers/misc/sgi-xp/xpc.h
@@ -164,8 +164,8 @@ struct xpc_vars_part_sn2 {
  * MAGIC2 indicates that this partition has pulled the remote partititions
  * per partition variables that pertain to this partition.
  */
-#define XPC_VP_MAGIC1	0x0053524156435058L   /* 'XPCVARS\0'L (little endian) */
-#define XPC_VP_MAGIC2	0x0073726176435058L   /* 'XPCvars\0'L (little endian) */
+#define XPC_VP_MAGIC1_SN2 0x0053524156435058L /* 'XPCVARS\0'L (little endian) */
+#define XPC_VP_MAGIC2_SN2 0x0073726176435058L /* 'XPCvars\0'L (little endian) */
 
 /* the reserved page sizes and offsets */
 
@@ -181,6 +181,80 @@ struct xpc_vars_part_sn2 {
 				  xpc_nasid_mask_nlongs))
 
 /*
+ * The activate_mq is used to send/receive messages that affect XPC's heartbeat,
+ * partition active state, and channel state. This is UV only.
+ */
+struct xpc_activate_mq_msghdr_uv {
+	short partid;		/* sender's partid */
+	u8 act_state;		/* sender's act_state at time msg sent */
+	u8 type;		/* message's type */
+	unsigned long rp_ts_jiffies; /* timestamp of sender's rp setup by XPC */
+};
+
+/* activate_mq defined message types */
+#define XPC_ACTIVATE_MQ_MSG_SYNC_ACT_STATE_UV		0
+#define XPC_ACTIVATE_MQ_MSG_INC_HEARTBEAT_UV		1
+#define XPC_ACTIVATE_MQ_MSG_OFFLINE_HEARTBEAT_UV	2
+#define XPC_ACTIVATE_MQ_MSG_ONLINE_HEARTBEAT_UV		3
+
+#define XPC_ACTIVATE_MQ_MSG_ACTIVATE_REQ_UV		4
+#define XPC_ACTIVATE_MQ_MSG_DEACTIVATE_REQ_UV		5
+
+#define XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREQUEST_UV	6
+#define XPC_ACTIVATE_MQ_MSG_CHCTL_CLOSEREPLY_UV		7
+#define XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREQUEST_UV	8
+#define XPC_ACTIVATE_MQ_MSG_CHCTL_OPENREPLY_UV		9
+
+#define XPC_ACTIVATE_MQ_MSG_MARK_ENGAGED_UV		10
+#define XPC_ACTIVATE_MQ_MSG_MARK_DISENGAGED_UV		11
+
+struct xpc_activate_mq_msg_uv {
+	struct xpc_activate_mq_msghdr_uv header;
+};
+
+struct xpc_activate_mq_msg_heartbeat_req_uv {
+	struct xpc_activate_mq_msghdr_uv header;
+	u64 heartbeat;
+};
+
+struct xpc_activate_mq_msg_activate_req_uv {
+	struct xpc_activate_mq_msghdr_uv header;
+	unsigned long rp_gpa;
+	unsigned long activate_mq_gpa;
+};
+
+struct xpc_activate_mq_msg_deactivate_req_uv {
+	struct xpc_activate_mq_msghdr_uv header;
+	enum xp_retval reason;
+};
+
+struct xpc_activate_mq_msg_chctl_closerequest_uv {
+	struct xpc_activate_mq_msghdr_uv header;
+	short ch_number;
+	enum xp_retval reason;
+};
+
+struct xpc_activate_mq_msg_chctl_closereply_uv {
+	struct xpc_activate_mq_msghdr_uv header;
+	short ch_number;
+};
+
+struct xpc_activate_mq_msg_chctl_openrequest_uv {
+	struct xpc_activate_mq_msghdr_uv header;
+	short ch_number;
+	short msg_size;		/* size of notify_mq's messages */
+	short local_nentries;	/* ??? Is this needed? What is? */
+};
+
+struct xpc_activate_mq_msg_chctl_openreply_uv {
+	struct xpc_activate_mq_msghdr_uv header;
+	short ch_number;
+	short remote_nentries;	/* ??? Is this needed? What is? */
+	short local_nentries;	/* ??? Is this needed? What is? */
+	unsigned long local_notify_mq_gpa;
+};
+
+/*
  * Functions registered by add_timer() or called by kernel_thread() only
  * allow for a single 64-bit argument. The following macros can be used to
  * pack and unpack two (32-bit, 16-bit or 8-bit) arguments into or out from
@@ -331,6 +405,18 @@ struct xpc_notify {
  */
 
 struct xpc_channel_sn2 {
+	struct xpc_openclose_args *local_openclose_args; /* args passed on */
+					     /* opening or closing of channel */
+
+	void *local_msgqueue_base;	/* base address of kmalloc'd space */
+	struct xpc_msg *local_msgqueue;	/* local message queue */
+	void *remote_msgqueue_base;	/* base address of kmalloc'd space */
+	struct xpc_msg *remote_msgqueue; /* cached copy of remote partition's */
+					 /* local message queue */
+	unsigned long remote_msgqueue_pa; /* phys addr of remote partition's */
+					  /* local message queue */
+
+	struct xpc_notify *notify_queue;    /* notify queue for messages sent */
 
 	/* various flavors of local and remote Get/Put values */
 
@@ -344,13 +430,14 @@ struct xpc_channel_sn2 {
 };
 
 struct xpc_channel_uv {
-	/* !!! code is coming */
+	unsigned long remote_notify_mq_gpa;	/* gru phys address of remote */
+						/* partition's notify mq */
 };
 
 struct xpc_channel {
 	short partid;		/* ID of remote partition connected */
 	spinlock_t lock;	/* lock for updating this structure */
-	u32 flags;		/* general flags */
+	unsigned int flags;	/* general flags */
 
 	enum xp_retval reason;	/* reason why channel is disconnect'g */
 	int reason_line;	/* line# disconnect initiated from */
@@ -361,14 +448,6 @@ struct xpc_channel {
 	u16 local_nentries;	/* #of msg entries in local msg queue */
 	u16 remote_nentries;	/* #of msg entries in remote msg queue */
 
-	void *local_msgqueue_base;	/* base address of kmalloc'd space */
-	struct xpc_msg *local_msgqueue;	/* local message queue */
-	void *remote_msgqueue_base;	/* base address of kmalloc'd space */
-	struct xpc_msg *remote_msgqueue; /* cached copy of remote partition's */
-					 /* local message queue */
-	unsigned long remote_msgqueue_pa; /* phys addr of remote partition's */
-					  /* local message queue */
-
 	atomic_t references;	/* #of external references to queues */
 
 	atomic_t n_on_msg_allocate_wq;	/* #on msg allocation wait queue */
@@ -377,19 +456,13 @@ struct xpc_channel {
 	u8 delayed_chctl_flags;	/* chctl flags received, but delayed */
 				/* action until channel disconnected */
 
-	/* queue of msg senders who want to be notified when msg received */
-
 	atomic_t n_to_notify;	/* #of msg senders to notify */
-	struct xpc_notify *notify_queue;    /* notify queue for messages sent */
 
 	xpc_channel_func func;	/* user's channel function */
 	void *key;		/* pointer to user's key */
 
 	struct completion wdisconnect_wait;    /* wait for channel disconnect */
 
-	struct xpc_openclose_args *local_openclose_args; /* args passed on */
-					     /* opening or closing of channel */
-
 	/* kthread management related fields */
 
 	atomic_t kthreads_assigned;	/* #of kthreads assigned to channel */
@@ -507,6 +580,8 @@ struct xpc_partition_sn2 {
 	unsigned long remote_GPs_pa; /* phys addr of remote partition's local */
 				     /* Get/Put values */
 
+	void *local_openclose_args_base;   /* base address of kmalloc'd space */
+	struct xpc_openclose_args *local_openclose_args;      /* local's args */
 	unsigned long remote_openclose_args_pa;	/* phys addr of remote's args */
 
 	int notify_IRQ_nasid;	/* nasid of where to send notify IRQs */
@@ -520,9 +595,27 @@ struct xpc_partition_sn2 {
 };
 
 struct xpc_partition_uv {
-	/* !!! code is coming */
+	unsigned long remote_activate_mq_gpa;	/* gru phys address of remote */
+						/* partition's activate mq */
+	spinlock_t flags_lock;	/* protect updating of flags */
+	unsigned int flags;	/* general flags */
+	u8 remote_act_state;	/* remote partition's act_state */
+	u8 act_state_req;	/* act_state request from remote partition */
+	enum xp_retval reason;	/* reason for deactivate act_state request */
+	u64 heartbeat;		/* incremented by remote partition */
 };
 
+/* struct xpc_partition_uv flags */
+
+#define XPC_P_HEARTBEAT_OFFLINE_UV	0x00000001
+#define XPC_P_ENGAGED_UV		0x00000002
+
+/* struct xpc_partition_uv act_state change requests */
+
+#define XPC_P_ASR_ACTIVATE_UV		0x01
+#define XPC_P_ASR_REACTIVATE_UV		0x02
+#define XPC_P_ASR_DEACTIVATE_UV		0x03
+
 struct xpc_partition {
 
 	/* XPC HB infrastructure */
@@ -556,8 +649,6 @@ struct xpc_partition {
 	union xpc_channel_ctl_flags chctl; /* chctl flags yet to be processed */
 	spinlock_t chctl_lock;	/* chctl flags lock */
 
-	void *local_openclose_args_base;   /* base address of kmalloc'd space */
-	struct xpc_openclose_args *local_openclose_args;      /* local's args */
 	void *remote_openclose_args_base;  /* base address of kmalloc'd space */
 	struct xpc_openclose_args *remote_openclose_args; /* copy of remote's */
 							  /* args */
@@ -616,17 +707,20 @@ extern struct device *xpc_part;
 extern struct device *xpc_chan;
 extern int xpc_disengage_timelimit;
 extern int xpc_disengage_timedout;
-extern atomic_t xpc_activate_IRQ_rcvd;
+extern int xpc_activate_IRQ_rcvd;
+extern spinlock_t xpc_activate_IRQ_rcvd_lock;
 extern wait_queue_head_t xpc_activate_IRQ_wq;
 extern void *xpc_heartbeating_to_mask;
+extern void *xpc_kzalloc_cacheline_aligned(size_t, gfp_t, void **);
 extern void xpc_activate_partition(struct xpc_partition *);
 extern void xpc_activate_kthreads(struct xpc_channel *, int);
 extern void xpc_create_kthreads(struct xpc_channel *, int, int);
 extern void xpc_disconnect_wait(int);
+extern int (*xpc_setup_partitions_sn) (void);
 extern enum xp_retval (*xpc_get_partition_rsvd_page_pa) (void *, u64 *,
 							 unsigned long *,
 							 size_t *);
-extern enum xp_retval (*xpc_rsvd_page_init) (struct xpc_rsvd_page *);
+extern int (*xpc_setup_rsvd_page_sn) (struct xpc_rsvd_page *);
 extern void (*xpc_heartbeat_init) (void);
 extern void (*xpc_heartbeat_exit) (void);
 extern void (*xpc_increment_heartbeat) (void);
@@ -635,8 +729,8 @@ extern void (*xpc_online_heartbeat) (void);
 extern enum xp_retval (*xpc_get_remote_heartbeat) (struct xpc_partition *);
 extern enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *);
 extern u64 (*xpc_get_chctl_all_flags) (struct xpc_partition *);
-extern enum xp_retval (*xpc_allocate_msgqueues) (struct xpc_channel *);
-extern void (*xpc_free_msgqueues) (struct xpc_channel *);
+extern enum xp_retval (*xpc_setup_msg_structures) (struct xpc_channel *);
+extern void (*xpc_teardown_msg_structures) (struct xpc_channel *);
 extern void (*xpc_notify_senders_of_disconnect) (struct xpc_channel *);
 extern void (*xpc_process_msg_chctl_flags) (struct xpc_partition *, int);
 extern int (*xpc_n_of_deliverable_msgs) (struct xpc_channel *);
@@ -647,9 +741,9 @@ extern void (*xpc_request_partition_reactivation) (struct xpc_partition *);
 extern void (*xpc_request_partition_deactivation) (struct xpc_partition *);
 extern void (*xpc_cancel_partition_deactivation_request) (
 							struct xpc_partition *);
-extern void (*xpc_process_activate_IRQ_rcvd) (int);
-extern enum xp_retval (*xpc_setup_infrastructure) (struct xpc_partition *);
-extern void (*xpc_teardown_infrastructure) (struct xpc_partition *);
+extern void (*xpc_process_activate_IRQ_rcvd) (void);
+extern enum xp_retval (*xpc_setup_ch_structures_sn) (struct xpc_partition *);
+extern void (*xpc_teardown_ch_structures_sn) (struct xpc_partition *);
 
 extern void (*xpc_indicate_partition_engaged) (struct xpc_partition *);
 extern int (*xpc_partition_engaged) (short);
@@ -665,6 +759,9 @@ extern void (*xpc_send_chctl_openrequest) (struct xpc_channel *,
 					   unsigned long *);
 extern void (*xpc_send_chctl_openreply) (struct xpc_channel *, unsigned long *);
 
+extern void (*xpc_save_remote_msgqueue_pa) (struct xpc_channel *,
+					    unsigned long);
+
 extern enum xp_retval (*xpc_send_msg) (struct xpc_channel *, u32, void *, u16,
 				       u8, xpc_notify_func, void *);
 extern void (*xpc_received_msg) (struct xpc_channel *, struct xpc_msg *);
@@ -674,7 +771,7 @@ extern int xpc_init_sn2(void);
 extern void xpc_exit_sn2(void);
 
 /* found in xpc_uv.c */
-extern void xpc_init_uv(void);
+extern int xpc_init_uv(void);
 extern void xpc_exit_uv(void);
 
 /* found in xpc_partition.c */
@@ -684,7 +781,8 @@ extern struct xpc_rsvd_page *xpc_rsvd_page;
 extern unsigned long *xpc_mach_nasids;
 extern struct xpc_partition *xpc_partitions;
 extern void *xpc_kmalloc_cacheline_aligned(size_t, gfp_t, void **);
-extern struct xpc_rsvd_page *xpc_setup_rsvd_page(void);
+extern int xpc_setup_rsvd_page(void);
+extern void xpc_teardown_rsvd_page(void);
 extern int xpc_identify_activate_IRQ_sender(void);
 extern int xpc_partition_disengaged(struct xpc_partition *);
 extern enum xp_retval xpc_mark_partition_active(struct xpc_partition *);

drivers/misc/sgi-xp/xpc_channel.c

View file

diff --git a/drivers/misc/sgi-xp/xpc_channel.c b/drivers/misc/sgi-xp/xpc_channel.c
index 17ab75d..73df9fb 100644
--- a/drivers/misc/sgi-xp/xpc_channel.c
+++ b/drivers/misc/sgi-xp/xpc_channel.c
@@ -39,7 +39,7 @@ xpc_process_connect(struct xpc_channel *ch, unsigned long *irq_flags)
 
 	if (!(ch->flags & XPC_C_SETUP)) {
 		spin_unlock_irqrestore(&ch->lock, *irq_flags);
-		ret = xpc_allocate_msgqueues(ch);
+		ret = xpc_setup_msg_structures(ch);
 		spin_lock_irqsave(&ch->lock, *irq_flags);
 
 		if (ret != xpSuccess)
@@ -62,8 +62,6 @@ xpc_process_connect(struct xpc_channel *ch, unsigned long *irq_flags)
 	if (!(ch->flags & XPC_C_ROPENREPLY))
 		return;
 
-	DBUG_ON(ch->remote_msgqueue_pa == 0);
-
 	ch->flags = (XPC_C_CONNECTED | XPC_C_SETUP);	/* clear all else */
 
 	dev_info(xpc_chan, "channel %d to partition %d connected\n",
@@ -134,13 +132,23 @@ xpc_process_disconnect(struct xpc_channel *ch, unsigned long *irq_flags)
 		spin_lock_irqsave(&ch->lock, *irq_flags);
 	}
 
+	DBUG_ON(atomic_read(&ch->n_to_notify) != 0);
+
 	/* it's now safe to free the channel's message queues */
-	xpc_free_msgqueues(ch);
+	xpc_teardown_msg_structures(ch);
+
+	ch->func = NULL;
+	ch->key = NULL;
+	ch->msg_size = 0;
+	ch->local_nentries = 0;
+	ch->remote_nentries = 0;
+	ch->kthreads_assigned_limit = 0;
+	ch->kthreads_idle_limit = 0;
 
 	/*
 	 * Mark the channel disconnected and clear all other flags, including
-	 * XPC_C_SETUP (because of call to xpc_free_msgqueues()) but not
-	 * including XPC_C_WDISCONNECT (if it was set).
+	 * XPC_C_SETUP (because of call to xpc_teardown_msg_structures()) but
+	 * not including XPC_C_WDISCONNECT (if it was set).
 	 */
 	ch->flags = (XPC_C_DISCONNECTED | (ch->flags & XPC_C_WDISCONNECT));
 
@@ -395,7 +403,7 @@ again:
 		DBUG_ON(args->remote_nentries == 0);
 
 		ch->flags |= XPC_C_ROPENREPLY;
-		ch->remote_msgqueue_pa = args->local_msgqueue_pa;
+		xpc_save_remote_msgqueue_pa(ch, args->local_msgqueue_pa);
 
 		if (args->local_nentries < ch->remote_nentries) {
 			dev_dbg(xpc_chan, "XPC_CHCTL_OPENREPLY: new "

drivers/misc/sgi-xp/xpc_main.c

View file

diff --git a/drivers/misc/sgi-xp/xpc_main.c b/drivers/misc/sgi-xp/xpc_main.c
index b303c13..13ec479 100644
--- a/drivers/misc/sgi-xp/xpc_main.c
+++ b/drivers/misc/sgi-xp/xpc_main.c
@@ -141,8 +141,9 @@ static struct ctl_table_header *xpc_sysctl;
 /* non-zero if any remote partition disengage was timed out */
 int xpc_disengage_timedout;
 
-/* #of activate IRQs received */
-atomic_t xpc_activate_IRQ_rcvd = ATOMIC_INIT(0);
+/* #of activate IRQs received and not yet processed */
+int xpc_activate_IRQ_rcvd;
+DEFINE_SPINLOCK(xpc_activate_IRQ_rcvd_lock);
 
 /* IRQ handler notifies this wait queue on receipt of an IRQ */
 DECLARE_WAIT_QUEUE_HEAD(xpc_activate_IRQ_wq);
@@ -169,10 +170,11 @@ static struct notifier_block xpc_die_notifier = {
 	.notifier_call = xpc_system_die,
 };
 
+int (*xpc_setup_partitions_sn) (void);
 enum xp_retval (*xpc_get_partition_rsvd_page_pa) (void *buf, u64 *cookie,
 						  unsigned long *rp_pa,
 						  size_t *len);
-enum xp_retval (*xpc_rsvd_page_init) (struct xpc_rsvd_page *rp);
+int (*xpc_setup_rsvd_page_sn) (struct xpc_rsvd_page *rp);
 void (*xpc_heartbeat_init) (void);
 void (*xpc_heartbeat_exit) (void);
 void (*xpc_increment_heartbeat) (void);
@@ -183,8 +185,8 @@ enum xp_retval (*xpc_get_remote_heartbeat) (struct xpc_partition *part);
 enum xp_retval (*xpc_make_first_contact) (struct xpc_partition *part);
 void (*xpc_notify_senders_of_disconnect) (struct xpc_channel *ch);
 u64 (*xpc_get_chctl_all_flags) (struct xpc_partition *part);
-enum xp_retval (*xpc_allocate_msgqueues) (struct xpc_channel *ch);
-void (*xpc_free_msgqueues) (struct xpc_channel *ch);
+enum xp_retval (*xpc_setup_msg_structures) (struct xpc_channel *ch);
+void (*xpc_teardown_msg_structures) (struct xpc_channel *ch);
 void (*xpc_process_msg_chctl_flags) (struct xpc_partition *part, int ch_number);
 int (*xpc_n_of_deliverable_msgs) (struct xpc_channel *ch);
 struct xpc_msg *(*xpc_get_deliverable_msg) (struct xpc_channel *ch);
@@ -196,9 +198,9 @@ void (*xpc_request_partition_reactivation) (struct xpc_partition *part);
 void (*xpc_request_partition_deactivation) (struct xpc_partition *part);
 void (*xpc_cancel_partition_deactivation_request) (struct xpc_partition *part);
 
-void (*xpc_process_activate_IRQ_rcvd) (int n_IRQs_expected);
-enum xp_retval (*xpc_setup_infrastructure) (struct xpc_partition *part);
-void (*xpc_teardown_infrastructure) (struct xpc_partition *part);
+void (*xpc_process_activate_IRQ_rcvd) (void);
+enum xp_retval (*xpc_setup_ch_structures_sn) (struct xpc_partition *part);
+void (*xpc_teardown_ch_structures_sn) (struct xpc_partition *part);
 
 void (*xpc_indicate_partition_engaged) (struct xpc_partition *part);
 int (*xpc_partition_engaged) (short partid);
@@ -215,6 +217,9 @@ void (*xpc_send_chctl_openrequest) (struct xpc_channel *ch,
 void (*xpc_send_chctl_openreply) (struct xpc_channel *ch,
 				  unsigned long *irq_flags);
 
+void (*xpc_save_remote_msgqueue_pa) (struct xpc_channel *ch,
+				     unsigned long msgqueue_pa);
+
 enum xp_retval (*xpc_send_msg) (struct xpc_channel *ch, u32 flags,
 				void *payload, u16 payload_size, u8 notify_type,
 				xpc_notify_func func, void *key);
@@ -308,8 +313,6 @@ xpc_check_remote_hb(void)
 static int
 xpc_hb_checker(void *ignore)
 {
-	int last_IRQ_count = 0;
-	int new_IRQ_count;
 	int force_IRQ = 0;
 
 	/* this thread was marked active by xpc_hb_init() */
@@ -325,43 +328,37 @@ xpc_hb_checker(void *ignore)
 		dev_dbg(xpc_part, "woke up with %d ticks rem; %d IRQs have "
 			"been received\n",
 			(int)(xpc_hb_check_timeout - jiffies),
-			atomic_read(&xpc_activate_IRQ_rcvd) - last_IRQ_count);
+			xpc_activate_IRQ_rcvd);
 
 		/* checking of remote heartbeats is skewed by IRQ handling */
 		if (time_is_before_eq_jiffies(xpc_hb_check_timeout)) {
+			xpc_hb_check_timeout = jiffies +
+			    (xpc_hb_check_interval * HZ);
+
 			dev_dbg(xpc_part, "checking remote heartbeats\n");
 			xpc_check_remote_hb();
 
 			/*
-			 * We need to periodically recheck to ensure no
-			 * IRQ/amo pairs have been missed.  That check
-			 * must always reset xpc_hb_check_timeout.
+			 * On sn2 we need to periodically recheck to ensure no
+			 * IRQ/amo pairs have been missed.
 			 */
-			force_IRQ = 1;
+			if (is_shub())
+				force_IRQ = 1;
 		}
 
 		/* check for outstanding IRQs */
-		new_IRQ_count = atomic_read(&xpc_activate_IRQ_rcvd);
-		if (last_IRQ_count < new_IRQ_count || force_IRQ != 0) {
+		if (xpc_activate_IRQ_rcvd > 0 || force_IRQ != 0) {
 			force_IRQ = 0;
-
-			dev_dbg(xpc_part, "found an IRQ to process; will be "
-				"resetting xpc_hb_check_timeout\n");
-
-			xpc_process_activate_IRQ_rcvd(new_IRQ_count -
-						      last_IRQ_count);
-			last_IRQ_count = new_IRQ_count;
-
-			xpc_hb_check_timeout = jiffies +
-			    (xpc_hb_check_interval * HZ);
+			dev_dbg(xpc_part, "processing activate IRQs "
+				"received\n");
+			xpc_process_activate_IRQ_rcvd();
 		}
 
 		/* wait for IRQ or timeout */
 		(void)wait_event_interruptible(xpc_activate_IRQ_wq,
-					       (last_IRQ_count < atomic_read(
-						&xpc_activate_IRQ_rcvd)
-						|| time_is_before_eq_jiffies(
+					       (time_is_before_eq_jiffies(
 						xpc_hb_check_timeout) ||
+						xpc_activate_IRQ_rcvd > 0 ||
 						xpc_exiting));
 	}
 
@@ -437,6 +434,153 @@ xpc_channel_mgr(struct xpc_partition *part)
 }
 
 /*
+ * Guarantee that the kzalloc'd memory is cacheline aligned.
+ */
+void *
+xpc_kzalloc_cacheline_aligned(size_t size, gfp_t flags, void **base)
+{
+	/* see if kzalloc will give us cachline aligned memory by default */
+	*base = kzalloc(size, flags);
+	if (*base == NULL)
+		return NULL;
+
+	if ((u64)*base == L1_CACHE_ALIGN((u64)*base))
+		return *base;
+
+	kfree(*base);
+
+	/* nope, we'll have to do it ourselves */
+	*base = kzalloc(size + L1_CACHE_BYTES, flags);
+	if (*base == NULL)
+		return NULL;
+
+	return (void *)L1_CACHE_ALIGN((u64)*base);
+}
+
+/*
+ * Setup the channel structures necessary to support XPartition Communication
+ * between the specified remote partition and the local one.
+ */
+static enum xp_retval
+xpc_setup_ch_structures(struct xpc_partition *part)
+{
+	enum xp_retval ret;
+	int ch_number;
+	struct xpc_channel *ch;
+	short partid = XPC_PARTID(part);
+
+	/*
+	 * Allocate all of the channel structures as a contiguous chunk of
+	 * memory.
+	 */
+	DBUG_ON(part->channels != NULL);
+	part->channels = kzalloc(sizeof(struct xpc_channel) * XPC_MAX_NCHANNELS,
+				 GFP_KERNEL);
+	if (part->channels == NULL) {
+		dev_err(xpc_chan, "can't get memory for channels\n");
+		return xpNoMemory;
+	}
+
+	/* allocate the remote open and close args */
+
+	part->remote_openclose_args =
+	    xpc_kzalloc_cacheline_aligned(XPC_OPENCLOSE_ARGS_SIZE,
+					  GFP_KERNEL, &part->
+					  remote_openclose_args_base);
+	if (part->remote_openclose_args == NULL) {
+		dev_err(xpc_chan, "can't get memory for remote connect args\n");
+		ret = xpNoMemory;
+		goto out_1;
+	}
+
+	part->chctl.all_flags = 0;
+	spin_lock_init(&part->chctl_lock);
+
+	atomic_set(&part->channel_mgr_requests, 1);
+	init_waitqueue_head(&part->channel_mgr_wq);
+
+	part->nchannels = XPC_MAX_NCHANNELS;
+
+	atomic_set(&part->nchannels_active, 0);
+	atomic_set(&part->nchannels_engaged, 0);
+
+	for (ch_number = 0; ch_number < part->nchannels; ch_number++) {
+		ch = &part->channels[ch_number];
+

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drivers/misc/sgi-xp/xpc_partition.c

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drivers/misc/sgi-xp/xpc_sn2.c

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drivers/misc/sgi-xp/xpc_uv.c

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